Typewriter jam release mechanism

Abstract

A jam release control for a typewriter provided with a motor driven power train to rotate a power roll. The train includes a normally engaged clutch which can be momentarily disengaged by an operator when the power train is jammed thereby allowing the motor to come up to speed and develop torque as will overcome a jam incident to reengagement of the clutch.

The invention claimed is: 
     
       1. In an electric typewriter having a frame mounting a power roll, a power train for continuously rotating said power roll, and a motor having an output shaft for driving said power train which motor is subject to stalling incident to overload demands on said power roll, and a normally engaged wrap spring clutch between said motor shaft and a pulley in said power train, manually operated means for momentarily disengaging said clutch to allow said motor to resume speed and deliver a power surge to said power roll on reengagement of said clutch,   said means including a friction band trained around both a frame-fixed part and a driven part of said clutch,   means resiliently connecting one end of said band to said frame,   a lever pivoted at one end on said frame,   means connecting the other end of said band to the other end of said lever,   operator controlled means for moving said lever about its pivot to tension said band on said clutch part to frictionally rotate said clutch part to unwind said wrap spring clutch to allow said motor to resume speed, said operator controlled means including a pivotally mounted segment-shaped member,   a link connected to lever and eccentrically mounted on said segment-shaped member, and   means for restoring said segment-shaped member after rotation and release thereof by an operator to allow said clutch to reengage.